Sparking plug



W A. JONES.

.- SPARKING PLUG.

APPLICATION FILED nc.7. I920.

Patented Aug 15. 1922..

WILLIAM ARTHUR JONES, or iuANcEEs-rmt, ENG AND, ASSIGNOR '10 SONJ'E LIMITED.

or MANCHESTER, ENGLAND, A. corIrANY or THE UNITED KINGDOM. or d mer" BRITAIN AND IRELAND.

SPARRING lPLUG,

i Application filed December 7, 1920. Serial No. 428,994.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1313.)

. To all whom it may concern new and useful Improvements in Sparking Plugs (for .which I have filed an 'apphcation in Great Britain Aug. 6th,'1)19, Ser. No. 19358), of which the following is a specification. I v

This invention relates to sparklng plugs for electrical ignition systems, and to sparking plugs of the kind n which the negative electrode or electrodes is or are mounted on the inner end of, and removable from the outer casing or plug body with,

' the insulating body which carrier the posi tive electrode. An object of the invention is to provide an improved arrangement for mounting and securing the negative electrode or electrodes on said insulating body.

whereby the construction of sparking plugs is simplified and eflicient. electrical con-nection between the negative electrode or electrodes and the outer casing or plug body 1s ensured.

According to this invention, the negative electrode or electrodes is or are mounted and secured on the insulating body which carries the positive electrode, by or through the. medium of a-ring or washer of conducting material which isa tight fit 'onthe insulating body against an abutment thereon and which is clamped between said abutment and a complemetary internal annular seat on the outer casing or plug body when the insulating body is 'fitted and secured therein.

In the accompanying drawings, which illustrate one embodiment of the invention,

Fig. l is an elevation of the sparking plug with the plug body and capor gland 1n section. Fig. 2 illustrates the insulating body removed from the plug body and as viewed from the left hand side of Fig. 1, and Figs. 3 and 4 are elevations at right angles to each other. Fig. 4 being partly in section of the inner end of the insulating body. to an enlarged scale, andlFig. 5 a sectional plan taken on the line 5-5 of Fig. 4.

The insulating body a carrying a central positive electrode 6 also carries a negative which engages with the plug body electrode 0 which is attached to the insulating body a by a'ring or washer d.

The free end 0 of the negative electrode 0 is appropriately shaped to form the com-' "'uNrr-Eo s'rArss PAJENT. OFFICE.

clamped between the said ring or Washer d and a shouldered or enlarged portion 6 of the insulating 'body a, the enlarged portion e being formed with a recess 7' for receiving the bent end portion '0 The recess may be formed in the enlarged portion by pressing the bent end e of the negative electrode 0 into the same, such as by pressure applied to the ring or washer d, which is made so as to be a tight fit on the'part g of the insulatin body. The part 9 of the insulating bo y a is formed with a lengthwise'groove h, to receive the stem of the electrode c.' The sparking end b of the positive electrode b may be cut away on the side facing the negative electrode,- as at b if found necessary, to ensure sparking taking place between theend b of the positive electrode and the end 0 of the negative electrode 0, and not between the stem of the negative electrode and the end of the positive electrode.

From the above description, it will be understod that the negative and positive electrodes and insulating'body are firmly connected and are removable from the plug from the spirit of the invention.

The insulatingbody constructed as abovewith the positive and negative electrodes attached thereto. is arranged in the plug body 7' with the ring or washer d restin on the internalllannular seat 1' thereof, an is secured in position by a gland nut 75 i an bears on a washer l fitted on the insu ating What I claim as my invention, and desire to secure by Letters Patent is z .1. A sparking plug eomprismg an 1n- 'sulating body provided with an abutment, an electrode mounted in said body, a complementary electrode mounted on said body, a ring or washer of conducting material separate from the complementary electrode and tightly fitting on said body against said abutment and securing said complementary electrode to said body to form a. unit therewith, an outer casing in which said insulating body is fitted and provided with an internal abutment against which said ring or washer bears, and means for securing said body on said casing.

2. A sparking plug comp-rising an insulating body provided with an abutment and formed with a groove in the exterior surface of its inner end, apositive electrode mounted in said insulating body, a complementary electrode mounted in said groove, a ring or washer of conducting material separate from the complementary electrode and forced on said insulating body to engage said abutment and secure said complementary electrode in said .groove,'an outer casing in which said insulating body is fitted having an internal abutment against which said ring or washer bears, and means for securing said insulating body in said outer casing. y

3. A sparking plug comprising an insulating body formed with a groove in the exterior surface of its inner end and provided With an abutment formed with a recess, a positive electrode mounted in said insulating body, a negative electrode mounted in sald groove and having one end lying in said recess, a ring or washer of conducting material fixed on said insulating body in engagement with said abutmentand securing said negative electrode, an outer casing In which said insulating body is mounted and provided with an internal abutment against which said ring or washer bears, and means for securing said insulating body in said casing.

In witness whereof I have my hand.

WILLIAM ARTHUR JONES.

hereunto set 

